Mercury came in 3 inch (1926-1957) and 9 inch (1927-1930). The 3 inch size shown here in flamingo also came in crystal, moongleam, hawthorne, sahara, and rarely in opalescent gold, and is marked at the constriction at the top of the stem. The 9 inch size came in crystal, moongleam and flamingo and is marked at the top of the column.
Imperial reproduced the 3 inch in crystal from 1958-1964.
(From The Collectors Encyclopedia of Heisey Glass 1925-1938 by Neila Bredehoft)
